Just barely

You grab the cuffs without alerting the pair. They are too busy licking each others asses out in preparation for the fucking you promised them.

Your goal now is simple- you need to immobilize them. If you can cuff Pippa's left arm to Dharma's left leg & vice-versa, the pair should be no problem at all anymore.

You undo both ends off the cuffs to save you time as you get ready for your attack. Don't get cocky now!

"Keep going you two, I'm going to make this even more fun."
"What do you have in mi...," Pippa starts to say.

You slap the cuff on her wrist, locking it securely. You quickly snap the other end on Dharma's ankle, not giving he friend the chance to warn her friend. Both girls are shocked by this turn of events.

"Let us go right now," Dharma says.
"Nope," you reply.

You climb onto the bed, laying stomach first across Pippa's back. This puts pressure on the pair and makes it even harder for them to struggle. This allows you to snap the other cuff on Dharma's left wrist and Pippa's right ankle with very little trouble.

You climb back off of the pair, but stop for a moment. Just for fun, you smack both of them on their asses. Not too hard, mind you- just enough to show them who's boss right now.

"Let us go," Pippa demands.
"Or what?"
"If you don't," Dharma replies, "We'll scream. That will bring Rachel in here."
"Good idea," you say, "I'll just hide and grab her when she comes in. There should be enough clothing in here between your outfits to tie her up too."
"Dammit, he's right," Pippa says.

You smile as the two continue to struggle. All this does is rub their nubile, naked bodies against each other though. I don't think that's what they have in mind.

"I'll be nice," you say, "After all, this is a game, right? I'll leave the key somewhere in the room for you two to find. In the meantime, I'll go see Rachel."

You turn to leave the room when a voice stops you.

"Don't go yet," Pippa says, "If you fuck our asses like you promised, we'll tell you where your clothes are- honest!"

Decisions, decisions...